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Caveolae facilitate TRPV4-mediated Ca

Yue Li1, Hongxiang Hu1, Roger G O'Neil1

  • 1Department of Integrative Biology and Pharmacology, The University of Texas Health Science Center at Houston , Houston, Texas.

American Journal of Physiology. Renal Physiology
|September 13, 2018
PubMed
Summary
This summary is machine-generated.

Caveolae microdomains organize TRPV4 and K+ channels (SK3, IK1, BK) in kidney cells, orchestrating calcium signaling essential for potassium secretion. This coordinated channel activation is crucial for kidney function.

Keywords:
IKSKTRPV4caveolaechannels

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Area of Science:

  • Cellular Physiology
  • Renal Physiology
  • Ion Channel Biology

Background:

  • Transient receptor potential cation channel subfamily V member 4 (TRPV4) signaling regulates kidney function.
  • Calcium-activated potassium (KCa) channels, including SK3, IK1, and BK, play critical roles in kidney cells.
  • Caveolae are specialized membrane microdomains involved in cellular signaling.

Purpose of the Study:

  • To investigate if caveolae orchestrate the sequential activation of TRPV4 and KCa channels in kidney cortical collecting duct (CCD) cells.
  • To determine the role of caveolin-1 (CAV-1) in this process.

Main Methods:

  • Utilized mCCDcl1 mouse principal cell line.
  • Performed knockdown of caveolin-1 (CAV-1).
  • Employed immunofluorescence colocalization and coimmunoprecipitation assays.

Main Results:

  • Knockdown of CAV-1 impaired TRPV4-mediated calcium signaling and KCa channel activation.
  • TRPV4, SK3, IK1, and BK channels were found to be directly coupled within caveolae.
  • CAV-1 colocalized and directly coupled with TRPV4 and all three KCa channels.

Conclusions:

  • Caveolae serve as critical microdomains for the coordinated coupling of TRPV4 with SK3, IK1, and BK channels in kidney principal and intercalated cells.
  • This caveolae-mediated signaling complex is essential for TRPV4-induced calcium signaling and sequential channel activation.
  • The findings highlight a key mechanism for Ca2+-dependent regulation of BK channels and K+ secretion in the kidney.